With Peixian County as the study area, the spatial variability of soil total nitrogen was studied by the geostatistics method on the basis of 212 soil samples, which were collected with regular grids through the county. The results showed that the mean value of soil total nitrogen content (0.96 g/kg) belongs to lower-middle level. The variation coefficient is 0. 31, and belongs to the medium level of variability. The auto-correlation distance of soil organic matter is 14 250 m. Moreover, the content of soil total nitrogen is mainly concentrated in the two grades of 0.75 -1.00 and 1.00 - 1.25 g/kg. In terms of spatial distribution, the lower content of soil total nitrogen mainly distributes in the north and south parts of Peixian County, where the dry land is dominated. Conversely, the highly content mainly distributes in the areas near Weishan Lake or Dasha River, where the paddy rice-upland crop rotation is dominant. The results show the different promotion potential of soil total nitrogen in different parts of the county, and will provide references for making agricultural management measures in Peixian County and even other areas in North Jiangsu.%以江苏省沛县为案例区,基于网格法采集的212个土壤样品,通过地统计学方法研究了该县土壤全氮空间变异特征.结果表明,该县土壤全氮含量均值属于中等偏下水平,仅为0.96 g/kg；变异系数为0.31,属中等变异程度；土壤全氮空间自相关性为中等程度,自相关距离为14 250 m;全县土壤全氮含量主要集中在0.75 ～1.00和1.00～ 1.25 g/kg2个等级；在空间上,该县北部和南部的旱地土壤全氮含量较低,其中北部的轻盐碱土含量为最低,而分别靠近微山湖和大沙河的东部和西部水—旱轮作区含量较高.研究结果指出该县不同区域土壤全氮含量的提升潜力,为该县乃至苏北地区制定合理的农业和环境管理措施提供参考.
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